void svc( SYSTEM_CALL_DATA *SystemCallData ) {
short call_type;
static short do_print = 10;
short i;
INT32 Time;
static long SleepTimer;
INT32 atLock = -1;
call_type = (short)SystemCallData->SystemCallNumber;
if ( do_print > 0 ) {
printf( "SVC handler: %s\n", call_names[call_type]);
for (i = 0; i < SystemCallData->NumberOfArguments - 1; i++ ){
//Value = (long)*SystemCallData->Argument[i];
printf( "Arg %d: Contents = (Decimal) %8ld, (Hex) %8lX\n", i,
(unsigned long )SystemCallData->Argument[i],
(unsigned long )SystemCallData->Argument[i]);
}
do_print--;
}
switch (call_type){
//get time service call
case SYSNUM_GET_TIME_OF_DAY: //This value is found in syscalls.h
CALL(MEM_READ( Z502ClockStatus, &Time ));
*SystemCallData->Argument[0] = Time;
break;
//terminate system call
case SYSNUM_TERMINATE_PROCESS:
CALL(MEM_READ( Z502ClockStatus, &Time ));
if(SystemCallData->Argument[0] == -1)
{
if(current_PCB_PTR->p_id==0)
{
CALL(Z502Halt());
break;
}
else
if(timerHead != NULL)
{
if(Time>TimerStatusTime)
{
start_timer(5);
CALL(Dispatcher());
break;
}
else
CALL(Dispatcher());
break;
}
else{
CALL(Dispatcher());
break;}
break;
}
else if(SystemCallData->Argument[0] == -2)
{
*SystemCallData->Argument[1] = ERR_SUCCESS;
CALL(Z502Halt());
break;
}
else
{
S_PCB *temp = readyHead;
S_PCB *prev = NULL;
while(temp != NULL)
{
if(temp->p_id ==SystemCallData->Argument[0])
{
if(temp->next == NULL)
{
*SystemCallData->Argument[1] = ERR_SUCCESS;
break;
}
else
{
*SystemCallData->Argument[1] = ERR_SUCCESS;
prev->next = temp->next;
break;
}
}
else
{
prev = temp;
temp = temp->next;
*SystemCallData->Argument[1] = ERR_SUCCESS;
break;
}
}
if(temp == NULL)
{
*SystemCallData->Argument[1] = CANNOTTERMINATE ;
}
}
break;
case SYSNUM_SLEEP:
//overTimeModify();
schedular_printer(SLEEP);
SleepTimer = SystemCallData->Argument[0];
CALL(MEM_READ( Z502ClockStatus, &Time ));
current_PCB_PTR->p_time = Time + SleepTimer;
lockTimer();
CALL(addToTimerQ(current_PCB_PTR));
unlockTimer();
if(Time<(timerHead->p_time)) //compare the wake time with current time
{
CALL(start_timer(SleepTimer));
CALL(Dispatcher());
}
else{ //if wake time is smaller than now, it need wake up immedately
CALL(start_timer(5));
CALL(Dispatcher());
}
break;
case SYSNUM_CREATE_PROCESS:
os_create_process(SystemCallData->Argument[0], SystemCallData->Argument[1],SystemCallData->Argument[2],SystemCallData->Argument[3],SystemCallData->Argument[4],NOTRUN);
break;
case SYSNUM_GET_PROCESS_ID:
os_get_process_id(SystemCallData->Argument[0], SystemCallData->Argument[1],SystemCallData->Argument[2]);
break;
case SYSNUM_SUSPEND_PROCESS:
os_suspend_process(SystemCallData->Argument[0], SystemCallData->Argument[1]);
break;
case SYSNUM_RESUME_PROCESS:
os_resume_process(SystemCallData->Argument[0], SystemCallData->Argument[1]);
break;
case SYSNUM_CHANGE_PRIORITY:
os_change_priority(SystemCallData->Argument[0], SystemCallData->Argument[1],SystemCallData->Argument[2]);
break;
case SYSNUM_SEND_MESSAGE:
os_send_message(SystemCallData->Argument[0], SystemCallData->Argument[1],SystemCallData->Argument[2],SystemCallData->Argument[3]);
break;
case SYSNUM_RECEIVE_MESSAGE:
os_receive_message(SystemCallData->Argument[0], SystemCallData->Argument[1],SystemCallData->Argument[2],SystemCallData->Argument[3],SystemCallData->Argument[4],SystemCallData->Argument[5]);
break;
default:
printf( "ERROR! Call type not reconginzed!\n");
printf( "Call_type is - %i\n", call_type);
}
}
void svc( SYSTEM_CALL_DATA *SystemCallData ) {
short call_type;
static short do_print = 10;
short i;
int Time;
int ID;
int k=0,m=0,n=0;
int PR;
int sid,tid,mlen;
int actual_length;
long tmp;
INT32 diskstatus;
long tmpid;
void *next_context;
char *tmpmsg;
PCB *head;
PCB *head1;
PCB *pcb = (PCB *)malloc(sizeof(PCB));
call_type = (short)SystemCallData->SystemCallNumber;
if ( do_print > 0 ) {
printf( "SVC handler: %s\n", call_names[call_type]);
for (i = 0; i < SystemCallData->NumberOfArguments - 1; i++ ) {
//Value = (long)*SystemCallData->Argument[i];
printf( "Arg %d: Contents = (Decimal) %8ld, (Hex) %8lX\n", i,
(unsigned long )SystemCallData->Argument[i],
(unsigned long )SystemCallData->Argument[i]);
}
}
switch(call_type) {
case SYSNUM_GET_TIME_OF_DAY:
MEM_READ(Z502ClockStatus, &Time);
//Z502_REG1=Time;
*SystemCallData->Argument[0]=Time;
break;
case SYSNUM_TERMINATE_PROCESS:
tmpid = (long)SystemCallData->Argument[0];
if(tmpid>=0) {
os_delete_process_ready(tmpid);
Z502_REG9 = ERR_SUCCESS;
}
else if(tmpid == -1)
{
head =Running;
Running = NULL;
while(readyfront==NULL&&timerfront==NULL) {
Z502Halt();
}
//free(head);
dispatcher();
Z502SwitchContext( SWITCH_CONTEXT_SAVE_MODE, &(Running->context) );
}
else
Z502Halt();
break;
//the execution of sleep();
case SYSNUM_SLEEP:
start_timer( (int)SystemCallData->Argument[0] );
break;
case SYSNUM_GET_PROCESS_ID:
*SystemCallData->Argument[1] = os_get_process_id((char *)SystemCallData->Argument[0]);
break;
case SYSNUM_CREATE_PROCESS:
strcpy(pcb->Processname , (char *)SystemCallData->Argument[0]);
pcb->Priority = (long)SystemCallData->Argument[2];
head = readyfront;
head1 = readyfront;
if(Pid < 20) {
if(pcb->Priority >0) {
if(readyfront == NULL&&readyrear == NULL) {
readyfront = pcb;
readyrear = pcb;
//*SystemCallData->Argument[4] = ERR_SUCCESS;
Z502_REG9 = ERR_SUCCESS;
pcb->pid = Pid;
pcb->next=NULL;
Toppriority = pcb->Priority;
*SystemCallData->Argument[3] = Pid;
//pcb->context = (void *)SystemCallData->Argument[1];
Z502MakeContext( &next_context, (void *)SystemCallData->Argument[1], USER_MODE );
pcb->context = next_context;
Pid++;
}
else if(readyfront!=NULL&&readyrear!=NULL) {
if(checkPCBname(pcb) == 1) {
if(pcb->Priority < Toppriority) {
Z502_REG9 = ERR_SUCCESS;
pcb->next = readyfront;
readyfront = pcb;
pcb->pid = Pid;
pcb->next=NULL;
Z502MakeContext( &next_context, (void *)SystemCallData->Argument[1], USER_MODE );
pcb->context = next_context;
*SystemCallData->Argument[3] = Pid;
Pid++;
}
else {
while(head->next!=NULL) {
if(pcb->Priority < head->Priority)
break;
else
head = head->next;
}
if(head->next!=NULL) {
while(head1->next!=head)
{
head1=head1->next;
}
Z502_REG9 = ERR_SUCCESS;
head1->next = pcb;
pcb->next=head;
pcb->pid = Pid;
Z502MakeContext( &next_context, (void *)SystemCallData->Argument[1], USER_MODE );
pcb->context = next_context;
*SystemCallData->Argument[3] = Pid;
Pid++;
}
else {
if(pcb->Priority < head->Priority) {
while(head1->next!=head)
{
head1=head1->next;
}
Z502_REG9 = ERR_SUCCESS;
head1->next=pcb;
pcb->next=head;
pcb->pid = Pid;
Z502MakeContext( &next_context, (void *)SystemCallData->Argument[1], USER_MODE );
pcb->context = next_context;
*SystemCallData->Argument[3] = Pid;
Pid++;
}
else {
Z502_REG9 = ERR_SUCCESS;
head->next = pcb;
readyrear = pcb;
pcb->next=NULL;
pcb->pid = Pid;
Z502MakeContext( &next_context, (void *)SystemCallData->Argument[1], USER_MODE );
pcb->context = next_context;
*SystemCallData->Argument[3] = Pid;
Pid++;
}
}
}
}
else free(pcb);
}
} else free(pcb);
}
else {
Z502_REG9++;
free(pcb);
}
break;
case SYSNUM_SUSPEND_PROCESS:
ID = (int)SystemCallData->Argument[0];
head = suspendfront;
while(head!=NULL) {
if(head->pid == ID) {
n = 1;
break;
}
else
head = head->next;
}
if(n!=1) {
head = readyfront;
while(head!=NULL) {
if(head->pid == ID) {
Z502_REG9 = ERR_SUCCESS;
suspend_process_ready(head);
k = 1;
break;
}
else
head = head->next;
}
if(k == 0) {
head = timerfront;
while(head!=NULL) {
if(head->pid == ID) {
Z502_REG9 = ERR_SUCCESS;
suspend_process_timer(head);
m = 1;
break;
}
else
head=head->next;
}
if(m == 0&&k == 0) {
printf("illegal PID\n");
}
}
}
if(n == 1) {
printf("can not suspend suspended process\n");
}
break;
case SYSNUM_RESUME_PROCESS:
ID = (int)SystemCallData->Argument[0];
head = suspendfront;
while(head!=NULL) {
if(head->pid == ID) {
k=1;
break;
}
else
head=head->next;
}
if(k==1)
resume_process(head);
else
printf("error\n");
break;
case SYSNUM_CHANGE_PRIORITY:
ID = (int)SystemCallData->Argument[0];
PR = (int)SystemCallData->Argument[1];
if(ID == -1) {
Running->Priority = PR;
Z502_REG9 = ERR_SUCCESS;
}
else {
if(PR < 100) {
if(checkReady(ID) == 1) {
head = readyfront;
while(head->pid != ID)
head=head->next;
change_priority_ready(head,PR);
Z502_REG9 = ERR_SUCCESS;
}
else if(checkTimer(ID) == 1) {
head = timerfront;
while(head->pid != ID)
head=head->next;
change_priority_timer(head,PR);
Z502_REG9 = ERR_SUCCESS;
}
else if(checkSuspend(ID) == 1) {
head = suspendfront;
while(head->pid != ID)
head = head->next;
change_priority_suspend(head,PR);
Z502_REG9 = ERR_SUCCESS;
}
else {
printf("ID ERROR!\n");
}
}
else {
printf("illegal Priority");
}
}
break;
case SYSNUM_SEND_MESSAGE:
sid = Running->pid;
tid = (int)SystemCallData->Argument[0];
tmpmsg =(char *)SystemCallData->Argument[1];
mlen = (int)SystemCallData->Argument[2];
if(maxbuffer < 8) {
if(tid < 100) {
if(mlen < 100)
{
if(tid>0)
{ send_message(sid,tid,mlen,tmpmsg);
maxbuffer++;
}
else if(tid == -1) {
send_message_to_all(sid,mlen,tmpmsg);
maxbuffer++;
}
}
else {
printf("illegal length!\n");
}
} else
printf("illegal id!\n");
}
else
{ printf("no space!\n");
Z502_REG9++;
}
break;
case SYSNUM_RECEIVE_MESSAGE:
sid = (int)SystemCallData->Argument[0];
mlen = (int)SystemCallData->Argument[2];
if(sid < 100) {
if(mlen < 100) {
if(sid == -1) {
receive_message_fromall();
if(msgnum>0) {
actual_length = strlen(checkmsg->msg_buffer);
if(mlen >actual_length) {
msg_out_queue(checkmsg);
*SystemCallData->Argument[3] = actual_length;
*SystemCallData->Argument[4] = checkmsg->source_pid;
strcpy((char *)SystemCallData->Argument[1] ,checkmsg->msg_buffer);
Z502_REG9 = ERR_SUCCESS;
}
else {
printf("small buffer!\n");
}
}
}
else {
receive_message_fromone(sid);
if(msgnum>0) {
actual_length = strlen(checkmsg->msg_buffer);
if(mlen >actual_length) {
msg_out_queue(checkmsg);
*SystemCallData->Argument[3] = actual_length;
*SystemCallData->Argument[4] = checkmsg->source_pid;
strcpy((char *)SystemCallData->Argument[1], checkmsg->msg_buffer);
Z502_REG9 = ERR_SUCCESS;
}
else {
printf("small buffer!\n");
}
}
}
}
else
printf("illegal length!\n");
}
else
printf("illegal id!\n");
break;
case SYSNUM_DISK_READ:
disk_read(SystemCallData->Argument[0],SystemCallData->Argument[1],SystemCallData->Argument[2]);
break;
case SYSNUM_DISK_WRITE:
disk_write(SystemCallData->Argument[0],SystemCallData->Argument[1],SystemCallData->Argument[2]);
break;
default:
printf("call_type %d cannot be recognized\n",call_type);
break;
}
do_print--;
}
